The second one is easier to read, since it is just a simple inheritance chain:
CommandViewModel : ViewModelBase
WorkspaceViewModel : ViewModelBase
CustomerViewModel : WorkspaceViewModel, IDataErrorInfo

what exactly u don't understand?
i assume u have object-oriented knowledge which is a fundamental to understand the relationships of the classes here.
i can go through each diagram and describe in words what are the relationships between the classes if u like.

Since I moved passed the Class Diagram tool to other things, I don't have a lot of experience with the all the symbols. In the first diagram, it looks like dependency/association links. I would be curious to know what those single, and double-arrow links mean.

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